过滤数据库中的查询SQLite

Question

我有一个数据库中的表，我想只显示此表的一行。该表有3个字段（ID，标题和说明）。 我想根据标题过滤行。

我有这样的代码：

光标光标= db.query（TABLE_NAME，FROM，NULL，NULL，NULL，NULL，ORDER_BY）;

其中第三个字段是选择之一（一个字符串）。但我不知道我必须准确地选择我想要显示的行。由于

Answer 1

String[] FROM = { // ID of the column(s) you want to get in the cursor 
     ID, 
     Title, 
     Description 
}; 

String where = "Title=?"; // the condition for the row(s) you want returned. 

String[] whereArgs = new String[] { // The value of the column specified above for the rows to be included in the response 
     "0" 
    }; 

return db.query(TABLE_NAME, FROM, where, whereArgs, null, null, null); 

这应该给你一个光标，你的所有列，但只包含行，其中的标题列的值等于0

Answer 2

试试这个

Cursor cursor = db.query("TABLE_NAME",new String[]{"ColumnName"}, "ColumnName=?",new String[]{"value"}, null, null, null); 

Answer 3

你可以在SQLite中按以下代码搜索;

In MainActivity;

search.addTextChangedListener(new TextWatcher() { 
    public void afterTextChanged(Editable s) { 
    } 
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
    } 
    public void onTextChanged(CharSequence s, int start, int before, int count) { 
     adapter.getFilter().filter(s.toString()); 
    } 
}); 
adapter.setFilterQueryProvider(new FilterQueryProvider() { 
    public Cursor runQuery(CharSequence constraint) { 
     return 
//Here you can filter data by any row , just change text replace of "subject" 
dbManager.fetchdatabyfilter(constraint.toString(),"subject"); 
    } 
}); 

DatabaseHelper.java

public Cursor fetchdatabyfilter(String inputText,String filtercolumn) throws SQLException { 
Cursor row = null; 
String query = "SELECT * FROM "+DatabaseHelper.TABLE_NAME; 
if (inputText == null || inputText.length() == 0) { 
    row = database.rawQuery(query, null); 
}else { 
    query = "SELECT * FROM "+DatabaseHelper.TABLE_NAME+" WHERE "+filtercolumn+" like '%"+inputText+"%'"; 
    row = database.rawQuery(query, null); 
} 
if (row != null) { 
    row.moveToFirst(); 
} 
return row; 
}